Cisco UCS C460 M4 Manuel utilisateur

Contents

Introduction

Requirements

Components Used

Background Information

Problem

Solution

Related Information

Introduction

This document describes an issue recognized with SAP HANA Scale-Out solutions with EMC VNC

storage attached which leads to an extended startup time of the Linux servers running the SAP

HANA application.

Requirements

Cisco recommends that you have a basic understanding of the preboot execution environment

(PXE) for a diskless environment and the standard Linux init boot process.

Components Used

The information in this document is based on these software and hardware versions:

SAP HANA Scale-Out solution with EMC VNX 5400 storage.

●

UCS C460-M4 and/or UCS B460-M4 servers

●

SUSE Linux Enterprise System 11.3

●

The information in this document was created from the devices in a specific lab environment. All of

the devices in this document started with a cleared (default) configuration following the solution

specific Cisco internal installation guidelines. If your solution is live, make sure that you

understand the potential impact of any command.

Background Information

The SAP HANA Scale-Out solutions are configured with two management servers to enable the

solution for the Preboot eXecution Environment (PXE) for diskless boot of the servers using a

network interface. The second management server exists for fault-tolerance reasons to avoid the

situation the servers cannot boot any longer in case of the first management server is not

available.

Note: Once the HANA server is up and running the management servers can be rebooted

without influencing the HANA servers.

The management server acts as DHCP and tftp server.

The EMC VNX storage acts as NFS server in this solution providing the nfsroot file system for

each server.

The boot process runs through the following steps:

The HANA server powers up including hardware self-checks.1. It sends a DHCP request via network interface eth0 (vlan 127) to the management server. 2. The management server provides the Server IP address and the tftp server IP address.3. In the next step it serves out the kernel and initrd from the tftpboot directory that is build at

installation time.

The HANA server loads the kernel and initrd from the tftpserver including all necessary

drivers available in initrd.

Once loaded the HANA server mounts the nfsroot volume via network interface eth0 (vlan

127).

Finally, the HANA server runs through the default Linux init process to complete the startup.7.

Problem

During the PXE boot process of the UCS servers the Linux init process stops for approximately 8

minutes when the network interfaces are activated. Afterwards the startup process continues

without any further issues.

When the HANA server runs through the default Linux init process it reads the network

configuration files as well and re-activates the network interfaces. The reason is the boot option

"onboot" is set to "yes" by default. This means the HANA server sends an additional DHCP

request to the management server and lose the file handler for the nfsroot volume at the same

time which stops the init process to continue.

There are no error messages visible on the console, but when you enter the boot options "debug

initcall_debug" you will notice the NFS server stops responding for approximately 8 minutes

sending "nfs: server 192.168.127.11 not responding, still trying" when reviewing the boot log

information.

Solution

Change the configuration file /etc/sysconfig/network/ifcfg-eth0 and add the option "ONBOOT='no'".

This is an example of the ifcfg-eth0 file:

Related Information

SUSE Documentation: "PXE Booting NFS or iSCSI Roots for a Diskless Environment"

SUSE Documentation: "SLES Administration - The Linux Boot Process"

Autres manuels pour UCS C460 M4

Ce manuel convient aux modèles suivants

Table des matières

Autres manuels Cisco Serveur

Cisco

Cisco AS5300-96VOIP-A Manuel utilisateur

Cisco

Cisco UCS 6500 Series Manuel utilisateur

Cisco

Cisco UCS C220 M3 Manuel utilisateur

Cisco

Cisco UCS B440 Manuel

Cisco

Cisco Content Delivery Engine CDE100 Manuel

Cisco

Cisco C880 M4 Manuel utilisateur

Cisco

Cisco UCS C480 M5 Instructions d'installation et d'entretien

Cisco

Cisco UCS B200 M3 Manuel du système

Cisco

Cisco UCS E Series Manuel utilisateur

Cisco

Cisco UCS C200 Instructions d'installation et d'entretien

Cisco

Cisco AS5300 - Universal Access Server Manuel utilisateur

Cisco

Cisco TelePresence Server 7010 Guide de référence

Cisco

Cisco TelePresence Server 7010 Manuel utilisateur

Cisco

Cisco UCS Invicta C3124SA Manuel

Cisco

Cisco UCS C220 Manuel utilisateur

Cisco

Cisco TelePresence MSE 8710 Manuel utilisateur

Cisco

Cisco UCS B440-M1 Guide rapide

Cisco

Cisco 7513 Series Mode d’emploi

Cisco

Cisco UCS C22 M3 Manuel utilisateur

Cisco

Cisco UCS C240 M5 Instructions d'installation et d'entretien

Cisco

Cisco UCS 5108 Manuel utilisateur

Cisco

Cisco APP1000 - One Application Server Appliance Mode d’emploi

Cisco

Cisco SNS-3400 Series Instructions de montage

Cisco

Cisco UCS B200 M5 Manuel

Manuels Serveur populaires d'autres marques

HP AlphaServer ES47 Manuel utilisateur

Dell

Dell PowerEdge R410 Manuel utilisateur

PowerNAS

PowerNAS CMA Manuel utilisateur

Supero

Supero FatTwin F617R3-FT Manuel utilisateur

MSI

MSI P1-109N-L70 Manuel utilisateur

Dell

Dell PowerEdge XE9640 Manuel

Dell

Dell PS4100 Instructions de montage

EtroVISION

EtroVISION EV3151 Manuel utilisateur

NEC

NEC Express5800/T110j Manuel utilisateur

HP ProLiant Gen9 Manuel utilisateur

Compaq

Compaq ProLiant 3000 Manuel

Dell

Dell PowerEdge 3YPMN Manuel utilisateur

iRobo

iRobo IPC2U Manuel utilisateur

Nortel

Nortel 1000 Con?guration guide Manuel utilisateur

Asus

Asus AP7500 Manuel d'utilisation et d'entretien

Avid Technology

Avid Technology AirSpeed 5000 Manuel utilisateur

HP Integrity rx2600 Guide d'installation

Milestone

Milestone Husky IVO 350T Manuel utilisateur